Results 11 to 20 of about 835 (94)
Methods in Ecology and Evolution, Volume 14, Issue 7, Page 1732-1746, July 2023., 2023 Abstract Our knowledge on the responses of permafrost ecosystems to climate warming is critical for assessing the direction and magnitude of permafrost carbon‐climate feedback. However, most of the previous experiments have only been able to warm the air and surface soil, with limited effects on the permafrost temperature.
Yuxuan Bai +8 more
wiley +1 more source
Conservation Biology, Volume 37, Issue 1, February 2023., 2023 Abstract Insights into declines in ecosystem resilience and their causes and effects can inform preemptive action to avoid ecosystem collapse and loss of biodiversity, ecosystem services, and human well‐being. Empirical studies of ecosystem collapse are rare and hampered by ecosystem complexity, nonlinear and lagged responses, and interactions across ...
David A. Keith +8 more
wiley +1 more source
A novel red‐edge spectral index for retrieving the leaf chlorophyll content
Methods in Ecology and Evolution, Volume 13, Issue 12, Page 2771-2787, December 2022., 2022 Abstract The leaf chlorophyll content (Chlleaf) is a crucial vegetation parameter in carbon cycle modelling and agricultural monitoring at local, regional and global scales. The red‐edge spectral region is sensitive to variations in Chlleaf. An increasing number of sensors are capable of sampling red‐edge bands, providing opportunities to estimate ...
Hu Zhang +15 more
wiley +1 more source
湘中山地土壤线虫(Nematoda)生态地理群的研究 [PDF]
, 1992 作者对湖南南岳衡山和长沙岳麓山土壤线虫进行了两年多的定位研究,共获得18511条土壤线虫标本.经分类鉴定,计有24个种 ...
伍惠生, 张友梅, 王振中
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Indian Pangolin in Lamjung Requires Urgent Attention 尼泊尔拉姆琼县地区的印度穿山甲急需关注
Wildlife Letters, Volume 2, Issue 4, Page 204-213, December 2024.This study documented the first evidence of the Indian pangolin in Lamjung district, Nepal, finding three burrows and rescue evidence in Simalchaur Naringhat Community Forest. The burrows identified at an elevation of 530 m and characterized by moderate crown and ground cover (26%–50%), a 25° slope, and predominantly red soil, are indicative of a ...
Asmit Neupane +4 more
wiley +1 more source
Corrosion environment evaluation and durability design requirements of coastal concrete bridge [PDF]
, 2013 依据JTg/T b07—01—2006《公路工程混凝土结构防腐技术规范》和gb/T 50476—2008《混凝土结构耐久性设计规范》,结合海南一个沿海混凝土大桥的具体环境条件和工程结构情况,对大桥所处腐蚀环境评价中环境分区、环境作用分级以及耐久性设计要求等问题进行了研究。大桥的环境作用分为一般环境、土中环境、海洋环境和滨海环境四个区域。一般环境处于海南东北部沿海腐蚀偏高范围,腐蚀性较高,分级提高加以考虑。土中环境主要由于砖红壤地质腐蚀加重的影响,在工程详细勘探和耐久性设计时给于关注 ...
余志勇, 李钢, 林挺宁, 石建光
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Shuitu Baochi Xuebao, 2006 通过实地调查与试验分析，研究了汤旺河流域4种经营类型红松林对土壤性质的影响情况。结果表明：在研究地区无论土壤pH、土壤有机质，还是土壤养分和土壤物理性质，白桦与红松天然更新形成的混变林和白桦与红松人工造林形成的混交林都较红松人工纯林优越，维护林分土壤地力及涵养水分的功能强。而红松人工纯林较原始红松林和两种白桦红松混交林维护地力及涵养水分功能弱。研究结果为汤旺河流域森林恢复与重建提供了科学合理的途径。
王树力
doaj +2 more sources
厌氧条件在不同Fe( II) 浓度测定方法中必要性的比较研究 [PDF]
, 2016 厌氧是目前Fe(II)测定方法中常选择的处理方式,但是不可避免会给实验操作带来不便。为了方便、准确地测定铁还原体系中的Fe(II)浓度,对比研究了厌氧条件对草酸—草酸铵和盐酸两种典型浸提方法测定Fe(II)浓度的影响。结果表明:对于草酸—草酸铵浸提法,厌氧条件是必须的,以防止提取液中的Fe(II)被氧化,而且样品浸提1 h 便可用于Fe(II)的测定;然而对于盐酸浸提法,厌氧条件却并不是必须的,对Fe(II)浓度测定基本不产生影响。因此,为简化实验操作或在没有厌氧条件的情况 ...
刘芳华 +1 more
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Monitoring and Evaluating Carbon Sink Capacity for Comprehensive Management of Soil and Water Conservation in Small Watersheds [PDF]
, 2023 [Objective] The carbon sinks of soil and vegetation were monitored and evaluated in order to provide technology and methodology for implementing dynamic monitoring and evaluation of carbon sinks for soil and water conservation projects, and to provide ...
Cheng Hui +6 more
core +1 more source
Study on Red Soil Modification and Phosphate Removal using Modified Res Soil [PDF]
, 2007 摘要 磷是水体富营养化的主要根源之一。如何减少废水中磷的排放量，已成为保护水体的重要课题。本文从开发廉价高效的磷吸附材料出发，初步研究了红壤作为磷吸附材料的吸附特性，并系统研究了红壤的改性方法，探讨了改性红壤的最佳制备条件，开展了改性红壤吸附去除水中磷酸根的研究，并初步探讨了其吸附机理，为以后的研究及工程应用提供实验和理论依据。经过实验，得出以下结论： (1)红壤具有较好的磷吸附性能，pH对红壤吸附磷的影响较小，且红壤对反应液有很好的pH缓冲作用。红壤对磷的吸附等温线对Langmuir方程拟合较好 ...
刘丽莉
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